Abstract
More than 20 years after the highly impacting ROSAT all-sky survey in the soft X-ray spectral range, we are close to the next major X-ray all/sky surveys with eROSITA. eROSITA will be the primary instrument on-board the Russian “Spectrum–Roentgen–Gamma” (SRG) satellite which will be launched from Baikonur in 2014 and placed in an L2 orbit. It will perform the first imaging all-sky survey in the medium energy X-ray range up to 10 keV with an unprecedented spectral and angular resolution. The eROSITA all sky X-ray survey will take place in a very different context than the ROSAT survey. There is now a wealth of complete, ongoing and planned surveys of the sky in broad range of wavelengths from the gamma, X-ray to the radio. A significant amount of science can be accomplished through the multi-frequency study of the eROSITA AGN and cluster sample, including optical confirmation and photometric redshift estimation of the eROSITA extended sources and AGNs. Optical spectroscopy has been, and will for the foreseeable future be, one of the main tools of astrophysics allowing studies of a large variety of astronomical objects over many fields of research. The fully capitalize on the eROSITA potential, a dedicated spectroscopic follow-up program is needed. 4MOST is the ideal instrument to secure the scientific success of the eROSITA X-ray survey and to overcome the small sample sizes together with selection biases that plagued past samples. The aim is to have the instrument commissioned in 2017, well matched to the data releases of eROSITA and Gaia. The design and implementation of the 4MOST facility simulator aimed to optimize the science output for eROSITA is described in necessary details.
Highlights
More than 20 years after the highly impacting ROSAT all-sky survey in the soft X-ray spectral range, we are close to the major X-ray all/sky surveys with eROSITA. eROSITA will be the primary instrument on-board the Russian “Spectrum–Roentgen–Gamma” (SRG) satellite which will be launched from Baikonur in 2014 and placed in an L2 orbit
1. eROSITA AGN science eROSITA will be the primary instrument on-board the Russian “Spectrum–Roentgen–Gamma” (SRG) satellite which will be launched from Baikonur in 2014 and placed in an L2 orbit. eROSITA offers a unique possibility to understand the AGN phenomenon more generally by extending AGN observations within an All-Sky Survey and subsequent detailed pointed observations
NarrowLine Seyfert 1 (NLS1) galaxies with their proven high accretion rates exceeding the Eddington limit by a factor of 10÷20 are most probably the objects with the highest black hole growth rates in the nearby universe are ideally suited for such studies
Summary
XMM-Newton observations appear to have decomposed the X-ray spectra of AGN into a strong, relativistically blurred reflection plus power law component (e.g. [15]). XMM-Newton observations appear to have decomposed the X-ray spectra of AGN into a strong, relativistically blurred reflection plus power law component Miller et al [20] have questioned the reverberation interpretation associated with the inner disc. Their results are consistent with a partial covering interpretation of a substantial fraction of scattered X-rays passing through an absorbing medium whose opacity decreases with increasing energy. As ROSAT and XMM-Newton provided new and fascinating observational results on NLS1 galaxies, the further study of this class will be striking in terms of even more exciting discoveries
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